APA (7th ed.) Citation

Cornwell, R. D. (1980). World history in the twentieth century (New ed.). Longman.

Chicago Style (17th ed.) Citation

Cornwell, R. D. World History in the Twentieth Century. New ed. Harlow, London: Longman, 1980.

MLA (9th ed.) Citation

Cornwell, R. D. World History in the Twentieth Century. New ed. Longman, 1980.